Sorry if this is slightly OT but :

Can someone comment how it will perform compared to

http://ralph.cs.cf.ac.uk/papers/geometry/cartoonvectorization.pdf ?

It looks like it gives good output compared to Adobe Live Trace.

IANAL but it looks like it's an (patent free) enhancement  of a previous work of

http://dcgi.felk.cvut.cz/home/sykorad/ (*)

which is patent free too.

So maybe there are tricks that could be "borrowed" to make the "kopf" even better ?

thx

PS:

* there are some interesting video about vector animation